AirHint found the following cheapest return flights from Denver (DEN) to Keflavik (KEF) in January 2026 (see full year).

Return flights

11 Jan - 18 Jan	Icelandair	direct
04 Jan - 11 Jan	Icelandair	direct
06 Jan - 13 Jan	Icelandair	direct
02 Jan - 10 Jan	Icelandair	direct
07 Jan - 14 Jan	British Airways
08 Jan - 15 Jan	Lufthansa
12 Jan - 19 Jan	British Airways
01 Jan - 08 Jan	British Airways
01 Jan - 09 Jan	jetBlue
09 Jan - 16 Jan	British Airways

Also check the deals for one-way flights from Denver to Keflavik in January.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Denver to Keflavik in January from 357€

Return flights